package jgl.vajra.kingkong.widget.manager;

import android.content.Context;
import android.os.Environment;

import jgl.vajra.kingkong.widget.retrofithelper.rxschedulers.RxSchedulersHelper;
import jgl.vajra.kingkong.widget.utils.FileUtils;

import java.io.File;
import java.math.BigDecimal;

import io.reactivex.Observable;
import io.reactivex.ObservableEmitter;
import io.reactivex.ObservableOnSubscribe;
import io.reactivex.annotations.NonNull;

public class DataCleanManager {
    private static class DataCleanManagerSingleton {
        private static final DataCleanManager INSTANCE = new DataCleanManager();

    }

    public static DataCleanManager getInstance() {
        return DataCleanManager.DataCleanManagerSingleton.INSTANCE;
    }

    public Observable<String> getTotalCacheSize(Context context) {
        return Observable.create(new ObservableOnSubscribe<String>() {
            @Override
            public void subscribe(@NonNull ObservableEmitter<String> emitter) throws Exception {
                long cacheSize = 0;
                try {
                    cacheSize += getFolderSize(context.getCacheDir());
                    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                        cacheSize += getFolderSize(context.getExternalCacheDir());
                        cacheSize += getFolderSize(new File(FileUtils.getDiskCacheDir()));
                        cacheSize += getFolderSize(FileUtils.getImageFolderFile());
                    }
                    emitter.onNext(getFormatSize(cacheSize));
                } catch (Exception e) {
                    emitter.onError(e);
                    e.printStackTrace();
                }
                emitter.onNext("0M");
            }
        }).compose(RxSchedulersHelper.applyIoTransformer());


    }

    public Observable clearAllCache(Context context) {
        return Observable.create(new ObservableOnSubscribe<Object>() {
            @Override
            public void subscribe(@NonNull ObservableEmitter<Object> emitter) throws Exception {
                deleteDir(context.getCacheDir());
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    deleteDir(context.getExternalCacheDir());
                    deleteDir(new File(FileUtils.getDiskCacheDir()));
                    deleteDir(FileUtils.getImageFolderFile());
                }
            }
        }).compose(RxSchedulersHelper.applyIoTransformer());

    }

    private boolean deleteDir(File dir) {
        if (dir != null && dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                boolean success = deleteDir(new File(dir, children[i]));
                if (!success) {
                    return false;
                }
            }
        }
        return dir.delete();
    }

    // 获取文件
    //Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据
    //Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据
    public long getFolderSize(File file) throws Exception {
        long size = 0;
        try {
            File[] fileList = file.listFiles();
            if (fileList != null) {
                for (int i = 0; i < fileList.length; i++) {
                    // 如果下面还有文件
                    if (fileList[i].isDirectory()) {
                        size = size + getFolderSize(fileList[i]);
                    } else {
                        size = size + fileList[i].length();
                    }
                }

            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }

    /**
     * 格式化单位
     *
     * @param size
     */
    public String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return "0M";
        }
        kiloByte = kiloByte / 1024 / 1024;
        BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
        return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                .toPlainString() + "M";

       /* double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "KB";
        }
        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "MB";
        }
        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
                    .toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
                + "TB";*/
    }
}
